In this photo provided by NASA, Sen. John Glenn poses for a portrait shortly after doing live television interviews from the Ohio State University Union building, Monday, Feb. 20, 2012, in Columbus, ... more 

In this photo provided by NASA, Sen. John Glenn poses for a portrait shortly after doing live television interviews from the Ohio State University Union building, Monday, Feb. 20, 2012, in Columbus, Ohio. Monday marks the 50th anniversary of Glenn's historic flight. Glenn was the first American to orbit Earth. (AP Photo/NASA, Bill Ingalls) MANDATORY CREDIT less